As our machining geometry gets more complicated, Autodesk® Fusion 360™ is up to the task! With a host of standard and adaptive toolpaths we can rapidly remove material from even the most complicated 3d parts. In this course, we explore how to rough and finish geometry that requires tool motion in X, Y, and Z simultaneously, learning how to finish even the finest of details. We’ll wrap up this course by creating a full CNC program for a part, simulating it, and exporting it to G-code.
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Enseigné par

Autodesk

Transcription

In this lesson, we'll be applying adaptive clearing toolpath to open pockets. After completing this lesson, you'll be able to, analyze the difference between 2D and 3D adaptive clearing. For the next lesson, we're going to be using our 2D pocket ready to program file. When you reopen a file that has cam data in it, you might notice inside of your setup that you have a red icon next to all your toolpaths. This doesn't mean that anything is wrong but it does mean that we need to go into Actions and generate those toolpaths again. With Fusion 360, what happens anytime you reopen the file or even if you navigate from manufacturer to design and back to manufacture, you might likely see those icons because you need to regenerate those toolpaths. It just mean that Fusion is checking for updates to faces or edges that you may have selected for those toolpaths, and it doesn't necessarily mean that you have to redo any of your work. Just simply regenerate it and make sure that your toolpaths don't have that red icon next to them. For this next lesson, we want to talk about ways in which we can apply these adaptive toolpaths to machining these open pockets on this part. First, I'm going to go into Models, expand this down to the body's folder and hide the stock because I don't need to see at this time. The first thing I want to do is explore some of the 3D adaptive clearing and pocket clearing toolpaths that we've already looked at. I'm first going to select pocket clearing, and I want to navigate to select a tool, and I'm going to go into my Cloud Save library and grab the half-inch flat end mill tool number 10. For geometry, right now it's set to a bounding box with tool centered on the boundary. What I want to do is I'm going to use these selection option and I want to grab this chain down here. I'm going to leave all the rest of the options as they are and say okay. Take a look at what the toolpath does. So you'll notice with this toolpath, it's treating the open edge as if it's closed. It doesn't have a way to know if that's open or not. If we go back and edit this operation, go back into the geometry, when we have a chain and we select it again, it brings up this dialogue box. This tells us that we have a closed contour selection. If we deselect that, it does allow us to create an open contour by working our way around and selecting different regions. However, even if we accept this, the green preview on the screen shows that it's still treating it as a closed pocket. This is telling me that this operation really just isn't going to work very well for us, unless we create some additional geometry that we can use to contain the tool. Let's take a look at how the adaptive clearing handles the same operation. Again, for the machining boundary, we're going to use a selection and we're going to grab the same selection. We're not going to use rest machining. We're also going to make sure that the tool containment is set to center which is a similar option we had for pocket, and say Okay. Again, I'm not modifying any other parameters. I simply want to see how these toolpaths handle the open pocket. You'll notice here that again it stops at this edge because it's still treating it as if it's a closed pocket. Whenever we're dealing with this type of geometry the best option that we have is to go into 2D and use our 2D adaptive clearing. While this doesn't give us the option to vary the step up and step down for curvature based geometry, this does handle our open pockets really well. Inside of our geometry section, we're going to select this geometry and you'll notice instantly on the screen when we hover over the edge, it's actually showing us an open selection. If we grab the face, you can also see the preview on the screen has highlighted the open section of that pocket. This is telling me that it instantly knows that this is open pocket geometry and when the toolpath is created, you'll notice that the tool starts from the outside and works its way in. So if we simulate this operation and we play through it, you can see that the tool starts from the outside of the stock and it works its way in. This is exactly how we should be handling open pocket geometry. So in this instance with this geometry, our best option is to go back to a 2D toolpath using 2D adaptive clearing, and simply use it because of its available options for open pocket geometry. We don't really need any of these other operations but feel free to save your file like we did previously. Then to go back, delete our pocket operation, delete our adaptive 3D operation, and then resave the file. So that way the most current version of this file has our individual adaptive toolpath. Also keep in mind that we can edit this toolpath and then the geometry section, we can add a secondary chain. We're going to say, okay, allow it to recalculate. Now it's going to handle both of those pockets. This helps us minimize our tool changes and notice that it rapids over to this geometry, comes in, cuts that open pocket out. Now we have one toolpath that handles both sides for us. Just as a reminder, this file we took a look at 2D adaptive when we were dealing with the closed pocket. We then use 2D adaptive again to handle the rest machining. We then did a 2D contour to finish off that geometry. Again we use the same 2D adaptive type toolpath to handle the larger open pockets on the bottom of this part. This part obviously has more that can be done. But for right now, we're going to save our file. That way we can move on.